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(No Model.) 4 Sheets-Sheet 1 -J. EL CRISP & L. D. JUNKINS.

TACK DRIVING MACHINE.

No. 500,225. Patented June 27, 1893.

WITNESSES; NWiN-FURE;

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(No Model.) 4 SheetB -Sheet 2;, J. E. CRISP & L. D.-JUNKINS.

. TACK DRIVING MACHINE;

Patented June 27, 1893.

IN ENTERS a WITNEEEEE 4Sheets-Sheet 3. J. B. CRISP 86 L- D. JUNKINS.

(No Model.)

TACK DRIVING MACHINE.

Patented June 27, 1893.

(No Model.) Sheets-8heet 4.

No. 500,225; Patented June 27, 1893.

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win-N15555:- I INJENT wasflaw/1% Fr -11 i a UNITED STATES PATENT OFFICE.

JOSEPH E. CRISP AND LEANDER D. JUNKINS, OF SOMERVILLE, MASSACHU- SETTS,ASSIGNORS TO THE COPELAND RAPID LASTER MANUFACTURING COMPANY.

TACK-DRIVING MACHINE.

SPECIFICATION forming part of Letters Patent No. 500,225, dated June 27,1893.

Application filed May l1 1892. Serial No. 82,564. (No model.)

To all whom it may concern.-

Be it known that we, JOSEPH E. CRISP and LEANDER D. JUNKINS, ofSomerville, in the county of Middlesex and State of Massachu- 5 setts,have invented certain new and useful Improvements in Tack-DrivingMachines; and we do hereby declare the following, with the annexeddrawings, to be a full, clear, and exact description of the invention,such as will enable others skilled in the art to which it appertains tomake and use the same.

Our invention relates to improvements upon hand tack drivers, which areprovided with an inclined chute or guide-way for leading loose tacks tothe tack feeding and driving mechanism.

It consists of simple and eifective mechanism for separating the tacksfrom the column in the lower end of the chute and moving and holdingthem under the driver of the machine.

It also consists of improved mechanism for guiding and limiting themotion of the plunger carrying the driver whereby the action of thespring for raising said plunger serves to z 5 automatically lock thevarious parts securely together as will be hereinafter described.

In the drawings forming part of this specification, Figure 1, is a sideelevation showing the machine and sufficient of the guideway to 0 showits relation thereto.' Fig. 2, is a vertical cross section of Fig. 1,Fig. 3, is a perspective view of the cross-pin guiding and limiting themotion of the plunger. Fig. 4, is a perspective view of the lock forholding the 3 5 cross pin in position,by the action of the raisingspring and which also acts as a piston within the hollow plunger. Figs.5 and 6, are enlarged views of the interior of the throat. Fig. 7, is anenlarged perspective view of the sep- 0 arating feeding and holdingdevice. Figs. 8 and 9, are enlarged vertical cross sections, showing themanner of moving the device Fig. 7. Figs. 10 and 11 are enlargedperspective views of the lower part of the machine cut at horizontalcross section at the upper side of the tack separating and feeding andholding device, and showing its mode of operation.

The shell of the machine A is made from any suitable metal, and to itsinterior the plunger B is fitted so that it will reciprocate and beguided therein as shown by Figs. 1 and 2. The plunger'B is made hollowfrom the top to near its lower end, and is provided with the slots, B, Bthrough its sides. These slots are made correct in length to allow thedesired reciprocation of the plunger when the round parts of the crosspin A are passed through them, and secured in the hole A in the sides ofthe shell A. To secure the cross pin A in position its center isflattened at A to fit the slot cut in the short cylindrical piece A Fig.4, and this piece is held thereon by the action of the raising spring Bupon its top surface as shown by Fig. 2. The raising spring B operateswithin the plunger B as shown and is secured therein by the screw plug Bat its upper end. The piece A is fitted to the hole inside of theplunger B and acts as a piston therein, thus operating as a dash pot andforming an air cushion and preventing the usual severe concussionincident to the quick rise of'spring elevated plungers. The cross pin Acould be flattened on one side so that the lower end of the raisingspring B would enter therein and prevent said pin from moving endwise incase the air cushion was not desired. To the lower end of the plunger Bare secured the driver B and the reciprocating cam B which moves outwardthe tack separating and feeding device.

The throat composed of the parts C, and C, is secured to a projectionformed on and below the shell A by the screws 0 C and in this throat areformed suitable holes C for the driver and C for the reciprocating camto pass through Figs. 2, 5, and 6. One end of the throat terminates nearthe hole for the driver 0 and there is a passage formed at C for theheads of the tacks to pass through into the driveway. The lower innersides of this passage are inclined toward the center of the driveway tocause the heads of the tacks to pass over, and drop down said inclineinto part of the throat is cut out at C so that it can be removed pastthe lower end of the driver when required.

The inclined chute or roadway E is of the usual construction and itslower endis fitted close to the end of the throat, where it is securedby the screws E, E, to a suitable part of the same projection to whichthe throat is secured. The relation of throat and chute is such as willcause the lower tack in the chute to rest against the driver for theaction of the tack separating and feeding mechanism when said driver isdown.

The tack separating and feeding mechanism Fig. 7, maybe made of one ormore pieces as preferred. It consists of the finger D, the arm D, thehinge D and the gate D This device is hung upon the pin D fixed in thehole 0'' and operates in a suitable slot 0 cut through the parts of thethroat. The end of the throat and the contacting end of the chute arealso cut away to allow the motion of said feedingdevice.Thetackseparatingand feeding finger D is made quite thin and operateswith its upper face just under the incline formed in the throat at C sothat it will e11- gage with the tack shanks near the head where it canmove them easily. This finger D is so formed that when inward as shownby Fig. 10, it completes the circle of the driveway and is provided atthat place with an inclined corner to insure the descent of the tackhead past its upper edge. The outer edge of this finger formsa rest forthecolumn of tacksin the chute, and from the place where the tacks restto its point, this edge being formed at such a curve that as it is swungoutward to catch and feed another tack, the column of tacks isconstantly descending and has acquired suificient momentum to quicklydrop the lower tack past the separating point, and against the driverwhen the finger D has reached the position shown by Fig. 11. The inneredge of the feed finger D, is inclined from the driveway to a pointwhich will a little more than pass back of the shank of a tack whosehead is resting against the driver when said finger moves inward fromthe position shown by Fig. 11, so that on the inward or active motion ofsaid finger, it will engage with said tack shank and designed to drive,and when closed separates the driveway from the passage in the chute.Its lower part is inclined toward the cent-er of the driveway andcontracts the passage sufficiently to hold the tacks, drawn in by thefeed finger, suspended by their heads under the driver, until the driverdescends, when the gate yields outwardly and allows the tack to be moveddown by the driver. The feed finger D, and gate D are swung out so thata tack can rest against the driver as shown in Fig. 11 by the inclinedreciprocating cam B acting against the bearing D formed on the arm D forthat purpose. The inclined cam B is form ed spirally to conform to themotion of the arm D, as it swings, and its relation to the driver ismade such that unless the tack under the driver is fairly driven, theend of the feed finger D will not disclose the passage from the chute tothe driver, and allow a tack to reach the position where the returnmotion of the feed finger will draw it under the driver, and allow thetack to be forced down upon the one already in the throat or nozzle ofthe machine. Secured to the chute E by one of the screws E is the springE of sufficient strength to swing the feed finger D, and gate D to theposition shown by Figs. 1, 2, 8 and 10, and

cause them to carry and hold a tack under the driver when said driver isup. The cam B as it moves up, separates from the bearing D when thepoint of the feeding finger is resting upon a tack shank, and allows thespring E to press the head of the tack shank against the side of thedriver, through the medium of the feed finger D and the friction thusproduced between driver and tack head causes the point of the tack toswing close to the body of the driver. When the lower end of the driverpasses up beyond the point of the tack, the point of the tack swingsinto the driveway, and as the lower end of the driver passes above thetack head, the feed finger D and the gate D snap completely in, andspring the head of the tack into the driveway, where it is caught andheld by the lower projecting part of the gate, until removed therefromby a descent of the driver. If it is desired to examine the interior ofthe throat of the machine, the spring E can be moved down from over thegate, and the gate and feed finger swung out giving free access thereto.Below the throat there is secured under the driveway a plain nozzle F inthe usual manner so that it will correctly align with said driveway.

From the foregoing it will be seen that this invention has severaladvantages, as follows: First. The decreased weight of the plunger dueto the interior hole for the raising spring, combined with theail-cushion, largely diminish the destructive blow usual where springraised plungers are positively stopped during their upward movement.Second. The plunger is more perfectly guided than where the spring forraising it operates in a pocket formed in the upper or lower part of theshell or guideway for said plunger. Third. The plunger is positivelysecured within the shell and when it is desired to remove it therefromit can be quickly done. Fourth. The feed finger can be made very lightwithout injury thereto, and there is little, if any chance of cloggingthe throat and nozzle by accumulation of tacks therein. Fifth. There areno projecting parts to be injured by coming in contact with the lastingmachine.

Having thus described our invention, what we claim, and desire to secureby Letters Patent, is-

1. The combination with the shell of a hand tack driving machine andsuitable tack feeding mechanism of a hollow slotted plunger carrying thetack driver, a raising spring therefor secured therein, a flattenedcross pin substantially as described for guiding the motion and limitingthe rise of said plunger, which is held in position by the action of theraising spring, all operating substantially as shown and described.

2. The combination with the shell of ahand tack driving machine andsuitable tack feeding mechanism, of a hollow slotted plunger carryingthe tack driver, a raising spring therefor secured therein, a flattenedcross pin and slotted piston substantially as described for guiding themotion and limiting the rise of said plunger, which are held in positionby the action of the raising spring and form in combination with theinterior of said plunger a dash pot to reduce concussion at thetermination of the rise of said plunger, substantially as shown anddescribed.

3. In combination with the shell of a hand tack driving machine, thehollow plunger B, provided with the slots B, the screw plug 13 thespring B the cross pin A, the slotted piston A the driver B, the cam 13and suitable tack separating and feeding mechanism all operatingsubstantially as described.

4. In combination with suitable tack driving mechanism, and an inclinedchute for guiding loose tacks to the driveway thereof, a tackseparating, feeding and holding device consisting of the finger D, arm Dhinge D gate D and bearing D constructed, located and operatingsubstantially as shown and described.

JOS. E. CRISP. L. D. J UNKINS.

\Vitnesses:

FRANK G. PARKER, MATTHEW M. BLUNT.

